Signatures of people that are still alive aren't worth anything? Huh? Says who? I'm not sure how much Nolan Bushnell's signature is worth, particularly. But being a comic fan, I can assure you that having signatures of artists and writers (dead or alive) on a comic book ups the value, if it's someone of importance. Some people go to conventions simply with the intention of getting signatures, then flipping those books on eBay.
However they are right about having documentation. No one will pay signature price without some Certificate of Authenticity. But having a pic of you and Nolan Bushnell can often be enough, in some cases. That is documentation. I've sold a comic or two using a pic and showing my convention guide.
